I cant give a wave modifier to fluid domain. Help?
The domain is just the area where the water/smoke simulation should be calculated.
You can add another shape (inside the domain) as an effector/collision to manage what you are asking for (for example the wave modifier to move the fluid).
I'm not sure that the wave modifier is the best way to give the water a shake..
check this simulation (I did not used the wave modifier, I just animated the internal cube, the one that is set as effector):